AutoCodes – Generic – P101A

P101A Code - Variable Valve Timing Self-Learning Function Stops Not Learned

Quick Answer

The Engine Control Module (ECM) monitors the Variable Valve Timing Self-Learning Function. Common causes include Variable Valve Timing Self-Learning. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P101A indicates Variable Valve Timing Self-Learning Function Stops Not Learned.
Common causes: Common causes include Variable Valve Timing Self-Learning.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 10,257

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 17, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P101A Description

The Engine Control Module (ECM) monitors the Variable Valve Timing Self-Learning Function. The OBDII code is set when the ECM detects that the Variable Valve Timing Self-Learning Function Stops Not Learned.

OBDII Code P101A - Variable Valve Timing Self-Learning Function Stops Not Learned - AutoCodes.com — P101A Code - Variable Valve Timing Self-Learning Function Stops Not Learned

What does this mean?

What are the Possible Causes of the DTC P101A?

Variable Valve Timing Self-Learning

How to Fix the DTC P101A?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P101A code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P101A code?

Need more information on how to fix the P101A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P101A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P101A BMW — Variable Valve Timing Self-Learning Function Stops Not Learned
P101A Buick — Reductant Control Module Sensor Communication Ground Circuit High Voltage
P101A Cadillac — Reductant Control Module Sensor Communication Ground Circuit High Voltage
P101A Chevrolet — Reductant Control Module Sensor Communication Ground Circuit High Voltage
P101A GMC — Reductant Control Module Sensor Communication Ground Circuit High Voltage
P101A Honda — Variable Valve Timing Control 'B' Advance Malfunction

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P101A Code

1. What are the common symptoms of OBDII code P101A (Variable Valve Timing Self-Learning Function Stops Not Learned)?

- Common symptoms include rough idling, decreased engine performance, poor fuel efficiency, and illuminated Check Engine Light.

2. What can cause the OBDII code P101A to trigger?

- The code P101A can be triggered by issues with the variable valve timing (VVT) system, such as faulty sensors, wiring problems, or a malfunctioning VVT actuator.

3. How can I diagnose the cause of code P101A?

- Diagnosing code P101A typically involves checking the VVT system components, inspecting wiring for damage, and using a scan tool to monitor VVT system data.

4. What are some repair tips for resolving OBDII code P101A?

- Repair tips may include replacing faulty VVT sensors, repairing damaged wiring, cleaning or replacing the VVT actuator, and performing a VVT system relearn procedure.

5. Can I continue driving with OBDII code P101A present?

- It is not recommended to continue driving with code P101A present, as it can lead to further engine damage and decreased performance if left unresolved.

6. How important is it to address OBDII code P101A promptly?

- It is important to address code P101A promptly to prevent potential engine damage, improve fuel efficiency, and ensure proper engine performance.

7. Can a DIY enthusiast fix OBDII code P101A at home?

- Depending on the underlying cause, DIY enthusiasts may be able to address code P101A at home by following repair procedures and using appropriate tools.

8. Is resetting the Check Engine Light enough to resolve OBDII code P101A?

- Simply resetting the Check Engine Light will not resolve code P101A, as it indicates an ongoing issue with the VVT system that needs to be diagnosed and repaired.

9. How long does it typically take to repair OBDII code P101A?

- The time needed to repair code P101A varies depending on the specific cause and repair process, but it can range from a few hours to a full day in some cases.

10. Are there any preventive measures to avoid OBDII code P101A in the future?

- Regular maintenance, such as changing oil and following manufacturer recommendations for VVT system care, can help prevent issues that may trigger code P101A.